... /8'' to 4'' Pressure: 2000LB, 3000LB, 6000LB for threaded fittings. 3000LB, 6000LB, 9000LB for socket fittings. CE and certification: API, ISO9001: 2000 ... ., USE: Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc. pipe fitting